Mechanical movement.



C. J. ROBERTSON.

MECHANICAL MOVEMENT.

APPLIoA'TloN FILED 111111. 21, 1905. nnnnwm) JUNI: 4, 1909. Y

Patented Jan -..M...H--, M ..1 J 11----..

O. J. ROBERTSON.

MECHANICAL MOVEMENT. y

APPLIOATION FILED MAR. 21, 1905. BBNBWBD JHM: 4, 1909.

945,11 98. Patsnted Jan 4,1910.

EEO

MA f

G. J. ROBERTSON.

MECHANICAL MOVEMENT. ArPLIoA'rIoN Hmm MAB. 21, 1905. nnnnwnn JUNI; 4, 1909.

945,1 98. Patented Jan. 4, 1910.

4 SHEETS-SHEET 3.

C. J. ROBERTSON.

MECHANICAL MOVEMENT.

APPLIUATION FILED 111111.21, 1905. RBNEWED JUNE 4, 1909.

I l 1 l I I l l 1 llillllll ||n||| l Il UNITED sTATEs PATENT oEEIcE.

CHARLES J. ROBERTSON, OF TAUNTON, MASSACHUSETTS, ASSIGNOR TO THE CAMPBELL PRINTING PRESS & MANUFACTURING COMPANY, 0F NEW YORK, N. Y., A CORPORA- TION 0E NEW YORK.

MECHANICAL MOVEMENT.

Patented Jaa-1., 191,0.

Application led March 21, 1905, Serial No. 251,206. Renewed June 4, 1909. Serial No. 500,121.

To all lwhom 'it may concern:

Be it known that I, CHARLES J ROBERT soN, a subject of the King of England, re-

siding at Taunton, in the county of Bristol and ate of Massachusetts, have invented a new and useful Mechanical Movement, of which the following is a specification.

This invention relates to that class of mechanical movements which convert rotary motion into rectilineal reciprocating motion, and which are especially adapted for moving reciprocating beds of`pr1nting presses or for use in other heavy machinery.

The especial object of. this invention is to provide Va mechanical movement employing a three-revolution crank-actuated reversing Vmechanism which is connected to operate 'for more than a half turn fora reversal.

To this end this invention consists of the mechanical movement, and of the combinations of parts therein as hereinafter described and more particularlympointed out in the claims at the end of this specification.

`In the accompanying :four sheets of drawings, Figure 1 is a 51de view of sufficient parts of a printing press to illustrate the application of this invention thereto. Fig. 2 is a transverse sectional view of the same.

Fig. 3 is a perspective view of the two in-4 dependently movable members of the pit-4 men for operating them from thecrank-pin Fig. 4 is a detail view showing the lockingpinsand means for operating the same to connect the bed to thevindependently movable members. Fi 5 is a diagrammatic view showing the ractions of a revolution movement at one end of the the parts upon the completion of a reversing movement, and at the commencement of the uniform printing movement of 4the bed.

Fig. 9,is-a diagrammatic view showing the position of the parts at the completion of the uniform speed printing movement, and at the beginning of the reversal at the other end of the press. Fi 10 is a diagrammatic view showing the position of the parts when the bed has reached the limit of movement 4revolving wrist-pin be connected by a bed at constant speed during the main for-Y ward stroke of the bed and at constant speed yduring the main part of the return movement of the bed, together with a reversin mechanism which reverses the direction o the motion of the bed at each end of its travel.

In the smaller sized printing presses the mechanical movement which has been used with most success is of the three-revolution type. That is to say, the crank reversing mechanism makes three revolutions for each complete cycle of operation. i

In the three-revolution type of bed motion each reversal has ordinarily occupied a half or less than a half turn of the reversing mechanism. In a three-revolution mechanical movement of this class where a reversal requires a half turn, -the complete time of operation is divided so that one full `turn takes place during the constant speed movement of the bed in one direction, a half turn takes place during one reversal of the bed; a full turn takes place during the constant speed return movement of the bed; and a half turn takes place during the other reversal of the bed.

In the larger size's ofA printing presses it has been found in practice that more time ought to be allowed for the reversals. To accomplish this result, I have provided a three-revolution mechanical movement in which a greater fraction than one-half of a turn is occupied by each reversal. I have accomplished this object by utilizing the sweet side of a pltman connection for each reverse.-

It is well-known in mechanics that if a itman to a sliding member, the'movement imparted to that member will be of different character at each side 4of the central position. This difference arises from the angular deection of the pitman, or as it is sometimes called to the pitman error. For example, in the operationof the pitman-connection shown in Fig. 6 ofthe drawings,

during the movement of the sliding member from its eXtreme position to the position illustrated by full lines in Fig. 6, the swing of the pitman has produced an advance or travel of the sliding member in addition to the travel due to the turning of the wristpin. From the position illustrated by full lines in Fig. 6 to the end of its motion 'the swing of the pitman will act oppositely to theadvance movement imparted by the turning of the wrist-pin, and 1t results from this pitman error that the reversal at one end of the travel of a pitman connected member will occupy more than a half turn of the wrist-pin and this long reverse may be called the sweet side of the pitman reverse.

In carrying out the particular object of this invention, .which is to provide a threerevolution mechanical movement having longer periods of reverse at each end than is now customary, I preferably employ two independently movable pitman-actuatedmembers, and I utilize the sweet side of one of the pitman connections of one of the movable members to reverse the bed at one end of its travel, and I use the sweet side of the pitman-connection of the other movable member to reverse the bed at theother end of its travel.

Referring tothe accompanying drawings for a detail description of suiiicient parts of a printing press to illustrate the application of this invention thereto, as shown in Fig. 1, A designates the usual frame-world having a. reciprocating bed B mounted thereon. The impression cylinder C is ournaledA eccentrically in bushings 10 mounted in the frame. The main driving shaft 11 to which power may be applied in any desired way, carries a gear 12 which meshes with `and drives the-gear 120 of the impression cylinder. Also mounted on the driving shaft 11 isa gear 13 which actuates the main driving mechanism. Meshing with the gear 13 is a gear 14 mounted 4on a shaft l5 carried by swinging arms 16. The

swinging arms 16 are connected by links 20 to eccentrics secured on a cross-shaft 21.

, movement to the bed, and which meshes with the bottom rack 19 to impart theconstant speed return movement to themed.; The gearl 17 acts as the main driving gear which meshes alternately with top and bottom racks to impart the main movements to the bed in either direction; The top and bottom racks 18 and 1.9 are shorter than the main racks ordinarily employed in threerevolution mechanical movements, so that the' main driving gear will remain in mesh for lessthan a full turn of the main shaft 11. Secured on the inner end of the main shaft 11 is a disk 23 carrying the wrist-pin 24. Extending fromone side of the wristpin 24 is a pitman` 25 which connects 'to a sliding member 26. Extending in the opposite direction from the wrist-pin 24 is a pitman 27 which connects to the sliding member 28. To connect the sliding members to the bed at proper times for reversals,

the bed is provided with a hanger 29 having lock pins 30 and 31. Thelock-pins 30 and 31 are operated by va three-armed lever 32, the extendingfarm of which runs in a movement as shown in Fig. 7 and will be brought backA to position to begin its constan-t speed printing movement as shown at -F ig. 8. This reversal will, as illustrated in Fig. 5, occupy a turning` movement-of the crank-pin from .the position a' to a. In the reversal at the other end of its travel, the bed will be connected to the other sliding member 28-as shown-in Fig. 9, will be carried to the end of its travel as shown in Fig. 10; .and will be returned as shown in Fig. 11. This reversal will occupy a turning movelment of the wrist-pin from position indicated at b in Fig. 5 to the position indicated at b. In the complete cycle of operation, therefore, it willbe seen that I have provided a crank-actuated reversing mechanism which. is'connected to act for more than ahalf turn for a reverse.

By changingthe proportlonal length of y the pitman with respect to the crank-arm,"I may lsecure variations of the4 relative proortions of time occupied by reversals, and

y means of this invention al three-revolution mechanical movement is provided'which canbe used to eater advantagejn the larger sized printing presses than the constructionswhieh are now employed.

In this application for. patent I do not desire to claim broadly aI mechanical movement embodying a crank-actuated reversing mechamsm connected to operate for more than a half turn for a reverse, as'I have' claimed this subject matter broadly in an movement, each reversal of which occupies more thana half turn.V

I am aware that many changes may be made by skilled mechanics in practicing this invention, and in applying the same to various styles and desi s of printing presses, .or to other machlnery. I do not4 wish, therefore, to be limited to the constructions I have herein .shown and described, but

What I do claim and desire to secure by Letters Patent of the United States is:--

1. A mechanical movement comprising a main driving mechanism, and a three-revolution cranlcactuated reversing lmechanism connected to operate more than a half turn -for a reverse.

2. A mechanical movement comprising 'a main driving mechanism, and a three-revolution crank-actuated reversing mechanism connected to reverse the bed at the extremes of its travel in either direction, .and to act for more than a half turn for each reversal.

3. In a mechanical movement, the combination of a main driving mechanism, and a crank-actuated reversing mechanism comprising two inde endently movable members, one of whic is connected to reverse the bed at onel end of its movement, and operates for more than a half-turn, and the other of which is connected to reverse the bed at the other end of its movement and operates for more than a half-turn.

4. In a mechanical movement, the combination of a moving bed or member, a main driving mechanism for imparting constant speed forward and backward movements thereto, a three-revolution wrist-pin, and a mechanism for connecting the same to the bed for more than a half revolution thereot for each reversing movement.

5. A mechanical movement comprising a main driving mechanism a revolvin crank and two pitmen connected thereto, with conv nections arranged so that the sweet side of one pitman will be used for reversing the -bed at one end of its travel and the sweet side of the other pitman will be used for reversing the bed at the other end of its travel.

6. A mechanicalmovement comprising a main driving mechanism, a revolving crank,

two pitmen and connections therefrom arranged so that the sweet side of one pitman will he employed for a reversing movement at one end of the travel, acting for more than a half turn of the crank, and so that the sweet side, ot` tht` other vpitman will be employed for the other reversing movement and act for more than a half turny of the crank.

7. In a mechanical movement, the combination of a main driving mechanism comprising top and bottom racks, and a driving pinion arranged to mesh alternately therewith, and a three-revolution crank-actuated reversing mechanism connected to operate for more than a half turn for a reverse. l

8. In a mechanical movement, the combination of a main driving mechanism comprising top and bottom racks, a driving pinion, and means for raising and lowering thc driving pinion to mesh rwith the top and bottom racks respectively, and a three-revolution crank-actuated .reversing mechanism connected to operate more than a half turn for a reverse.

9. In a mechanical movement, the combination of a main driving mechanism, and a three revolution crank actuated reversing mechanism comprising a wrist-pin, two independent sliding members, a pitman connecting each of the sliding members to the wrist-pin, and means for connecting the sliding members to the bed operating so that each reversal of the bed will occupy more than a half turn of the wrist-pin.

10. In a mechanical movement, the combination of the main driving mechanism comprising top and bottom racks, a driving pinion, and means for raising and lowering the driving pinion, to mesh with the top and bottom racks respectively, and a three-revolution crank-actuated reversing mechanism com rising a revolving Wrist-pin, two independhntly movable sliding members, a pitman connecting the sliding member to the bed operating so that each reversal will occupy more than a half turn of the wrist-pin.

In testimony whereof I have hereunto set my hand, in the 2 witnesses.

o. J. ROBERTSON. Witnesses:

ROBERT T. JOHNSTON,

FRED J. Vmwno.

presence of two subscribing 

